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PSA: Docker nukes your firewall rules and replaces them with its own. (sh.itjust.works)

submitted 8 months ago* (last edited 8 months ago) by [email protected] to c/[email protected]

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I use nftables to set my firewall rules. I typically manually configure the rules myself. Recently, I just happened to dump the ruleset, and, much to my surprise, my config was gone, and it was replaced with an enourmous amount of extremely cryptic firewall rules. After a quick examination of the rules, I found that it was Docker that had modified them. And after some brief research, I found a number of open issues, just like this one, of people complaining about this behaviour. I think it's an enourmous security risk to have Docker silently do this by default.

I have heard that Podman doesn't suffer from this issue, as it is daemonless. If that is true, I will certainly be switching from Docker to Podman.

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[–] [email protected] 6 points 8 months ago (4 children)

Wow, thanks for the heads up.

Looks like it affects dockerd, but not docker desktop.

Any idea of the docker implementation in Proxmox or TrueNAS? (TrueNAS does containers if I remember right?)

[–] [email protected] 1 points 8 months ago

ofcourse docker desktop is not affected because it's a vm running docker running on your computer. the nftables inside the container are modified by docker

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